21401140404 has 192 divisors, whose sum is σ = 61273884672. Its totient is φ = 5674905600.

The previous prime is 21401140403. The next prime is 21401140427. The reversal of 21401140404 is 40404110412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401140403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43586599 + ... + 43587089.

It is an arithmetic number, because the mean of its divisors is an integer number (319134816).

Almost surely, 2^21401140404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21401140404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30636942336).

21401140404 is an abundant number, since it is smaller than the sum of its proper divisors (39872744268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21401140404 is a wasteful number, since it uses less digits than its factorization.

21401140404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21401140404 its reverse (40404110412), we get a palindrome (61805250816).

The spelling of 21401140404 in words is "twenty-one billion, four hundred one million, one hundred forty thousand, four hundred four".